Error after openeing gpx-File

[inet@…]

What steps will reproduce the problem?

1. Start OSM
2. Open GPX-File

What is the expected result?
Opening without error
What happens instead?
Error Message
Please provide any additional information below. Attach a screenshot if
possible.

Build-Date: 2009-12-13 02:31:40
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Author: jttt
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Date: 2009-12-12 21:25:10 +0100 (Sat, 12 Dec 2009)
Last Changed Rev: 2623
Repository Root: http://josm.openstreetmap.de/svn
Revision: 2623

Memory Usage: 31 MB / 63 MB (9 MB allocated, but free)
Java version: 1.5.0_22


Plugins: wmsplugin
Plugin wmsplugin Version: 18953

java.lang.NullPointerException
	at org.openstreetmap.josm.data.osm.event.DatasetEventManager.activeLayerChange(DatasetEventManager.java:71)
	at org.openstreetmap.josm.gui.MapView.fireActiveLayerChanged(MapView.java:107)
	at org.openstreetmap.josm.gui.MapView.setActiveLayer(MapView.java:581)
	at org.openstreetmap.josm.gui.MapView.addLayer(MapView.java:248)
	at org.openstreetmap.josm.Main.addLayer(Main.java:246)
	at org.openstreetmap.josm.io.GpxImporter$1.run(GpxImporter.java:56)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:180)
	at java.awt.Dialog$1.run(Dialog.java:535)
	at java.awt.Dialog$2.run(Dialog.java:565)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Dialog.show(Dialog.java:563)
	at java.awt.Component.show(Component.java:1302)
	at java.awt.Component.setVisible(Component.java:1255)
	at org.openstreetmap.josm.gui.progress.PleaseWaitProgressMonitor$3.run(PleaseWaitProgressMonitor.java:78)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

[anonymous]

Closed as duplicate of #4159.